5.1 Provide a brief definition of network access control. 5.2 What is an EAP? 5.3 List and briefly define four EAP authentication methods. 5.4 What is EAPOL? 5.5 What is the function of IEEE 802.1X? 5.6 Define cloud computing. 5.7 List and briefly define three cloud service models. 5.8 What is the cloud computing reference architecture? 5.9 Describe some of the main cloud-specific security threats.